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Problem P. 4101. (October 2008)

P. 4101. Several batteries, all having the same electromotive forces and the same internal resistances, were connected first in parallel and then in series and a resistor of resistance 129 \Omega was connected into the circuit. It was found that in case of the series connection the terminal voltage across each battery is 10% less than in case of the parallel connection. How many batteries were used?

(4 pont)

Deadline expired on 11 November 2008.


Statistics:

71 students sent a solution.
4 points:52 students.
3 points:3 students.
2 points:5 students.
1 point:11 students.

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